Acknowledgments

The authors gratefully acknowledge the support and guidance of Mr. Ralph Gillmann of the Office of Highway Policy Information of Federal Highway Administration throughout this project. His valuable review comments of the concepts and methodologies are acknowledged.

The authors also acknowledge the valuable review comments by the following individuals and offices of the Federal Highway Administration (FHWA):

Mr. Richard Reel, Florida Department of Transportation

Mr. Mark Demidovich, Georgia Department of Transportation

Mr. John Rosen, Washington State Department of Transportation

Ms. Jonette Kreideweis, Minnesota Department of Transportation

Mr. Joe Avis, California Department of Transportation

Mr. David Gardner, Ohio Department of Transportation

Ms. Raelene Viste, Idaho Department of Transportation

Dr. Mark Hallenbeck, University of Washington

FHWA's Traffic Monitoring and Standards Division

FHWA's HPMS Division

FHWA's Office of Safety on Highway Safety

The authors also acknowledge the assistance of Mr. Brian Burk of Texas Department of Transportation, Ms. Terri Johnson and Mr. John Collins of Mobility Technologies, Inc, and Mr. David Garner of Ohio Department of Transportation in providing data for the case studies included in this report.